Oracle Exadata X10M Service Manual page 30

Table 2-1 Server Power Issues
Power Description
Issue
AC Power The AC power cords are the direct
Connection connection between the server power
supplies and the power sources. The server
power supplies need separate stable AC
circuits.
Insufficient voltage levels or fluctuations in
power can cause server power problems.
The power supplies operate at a particular
voltage and within an acceptable range of
voltage fluctuations. Refer to
Requirements.
Power The server power supplies (PS0, PS1)
Supplies provide the necessary server voltages from
(PS) the AC power outlets. If the power supplies
are inoperable, unplugged, or disengaged
from the internal connectors, the server
cannot power on.
Note: Use the Velcro straps on the back of
the server to secure the power cord
connectors to the back of the power
supplies. The Velcro retaining straps
minimize the risk of accidental
disconnection.
Top Cover The server top cover maintains the air
pressures inside the server, prevents
accidental exposure to hazardous voltages,
and protects internal components from
physical and environmental damage.
Action
Verify that both AC power
cords are connected to the
server Verify that the correct
power is present at the
outlets and monitor the
power to verify that it is
within the acceptable range.
Verify proper connection and
operation by verifying the
Electrical
power supply (PS) indicator
panels, which are located at
the back of the server on the
power supplies. Lit green AC
OK indicators indicate a
properly functioning power
supply. An amber AC OK
indicator indicates that the
AC power to the power
supply is insufficient.
Verify that the AC cables are
connected to both power
supplies. Verify that the
power supplies are
operational (the PS indicator
panel must have a lit green
AC OK indicator).
Ensure that the power
supply is properly installed.
A power supply that is not
fully engaged with its internal
connector does not have
power applied and does not
have a lit green AC OK
indicator
When installing a power
supply, ensure that it is fully
seated and engaged with its
connector inside the drive
bay. A properly installed
power supply has a lit green
AC OK indicator.
Do not operate the server
without the top cover
installed unless you are hot-
plugging a fan module, and
then ensure that you
complete the operation and
replace the cover within 60
seconds. See
Modules
and
Server Top Cover.
Diagnosing Server Component Hardware Faults
Prevention
Use the AC power cord
Velcro retaining clips and
position the cords to
minimize the risk of
accidental
disconnection. Ensure
that the AC circuits that
supply power to the
server are stable and not
overburdened.
When a power supply
fails, replace it
immediately. To ensure
redundancy, the server
has two power supplies.
This redundant
configuration prevents
server downtime, or an
unexpected shutdown,
due to a failed power
supply.
Redundancy allows the
server to continue to
operate if one of the
power supplies fails.
However, when a server
is being powered by a
single power supply, the
redundancy no longer
exists, and the risk for
downtime or an
unexpected shutdown
increases.
Be careful to avoid
bending or otherwise
warping the top cover.
Servicing Fan
Install the
Chapter 2
2-6